How to perform reverse permute to an already permuted matrix?

Abirami

2015 4 21

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Hello, I have taken a color image as input and separated out the R G and B components. And then I converted the three planes into 1 D vectors. Consider a 4x4x3 matrix.The planes are interleaved as follows

V=[r1g1b1....r6]
W=[g6b6r7...g11] 
X=[b11r12...b16]

The following is the code that I used to permute the three planes.

 A=imread('C:\Users\Desktop\lena.jpg');
 R = A(:, :, 1);
 G = A(:, :, 2);
 B = A(:, :, 3);
 R1 = reshape(R.',1,[]);
 G1 = reshape(G.',1,[]);
 B1 = reshape(B.',1,[]);
 H = permute(A, [3 1 2]);
 N = numel(A)/3;
 V = H(1 : N);
 W = H(N + 1 : 2*N);
 X = H(2*N + 1 : end);

Now I need to reverse this function ie; de-interleave the vectors and separate out the three planes and then combine them to get the original image. I dont know how to perform the inverse. I used ipermute function as follows, but i'm not able to obtain a proper result.I have obtained S,T and U which are equal to V,W and X. Dimg is equal to H.

C = ipermute(Dimg, [3 1 2])

Please help.Thanks in advance.